Water control structure

1. A method for manufacturing a water control system on the surface of a dam or waterway, the method comprising:

(a) providing a form structure including a base and multiple side walls; wherein said base includes a removable panel;

(b) placing concrete in said form;

(c) curing said concrete to form a pre-cast shell in said form;

(d) removing said panel from said base;

(e) inverting said form;

(f) installing a gate system on said pre-cast shell;

(g) positioning said inverted form on the surface of said dam or waterway;

(h) removing said form from said pre-cast shell.

2. The method of claim 1 , wherein said form includes a ballast chamber system enabling said form to float in water with said shell in said form.

3. The method of claim 2 , wherein said form is inverted by controlling the relative air and water content in said ballast chamber system.

4. The method of claim 1 , wherein said gate system comprises a gate having a leadingedge pivotably mounted to said pre-cast shell.

5. The method of claim 4 , wherein said gate system further comprises an inflatable bladder between said gate and said pre-cast shell; wherein said bladder is adapted to pivot said gate upwardly when said bladder is inflated.

6. The method of claim 1 , wherein said form includes a removeable end portion.

7. The method of claim 1 , further comprising the step of placing rebar or anchor bolts in said form prior to adding concrete thereto.

8. The method of claim 1 , wherein the surface of said dam or waterway includes upright piers for supporting said pre-cast shell.

9. The method of claim 8 , further comprising placing leveling bolts between said piers and said pre-cast shell enabling said pre-cast shells to be raised or lowered relative to said piers.